Besides the fact that you're simply not right (COM, MFC, ATL, SWF, WPF, etc are all deprecated yet still supported and maintained), how is this on topic?
Many of the .NET APIs became COM based ones on Vista, with plain C Win32 ones being less and less common until we got WinRT, as the sibling comment points out.
Interesting enough WinRT shares many ideas with the genesis of .NET, before they decided to go the CLR route.
WCF is still being supported, there was a .NET Conf 2017 session.
Highly ironic for a framework that's called Universal Windows Platform :D